100 questions on arithmetic sequences, geometric sequences, series, and sigma (Σ) notation — starting easy, ending hard. Work through it all in one scroll, get instant explanations, and print a clean copy when you're done.
Subject
Mathematics
Unit
Sequences & Series
Level
Grade 8–9
Questions
100
Quick concept refresher
Read this once before you start — every question links back to one of these four ideas.
Arithmetic sequence — add the same number (d) each time.
aₙ = a₁ + (n − 1)d
Geometric sequence — multiply by the same number (r) each time.
aₙ = a₁ · r^(n−1)
Series — the running total when you add sequence terms up.
Sₙ = n(a₁+aₙ)/2 | Sₙ = a₁(rⁿ−1)/(r−1)
Sigma (Σ) — a short way to write "add these up."
Σ(k=1 to n) f(k) = f(1)+f(2)+...+f(n)
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